Copying a sail that way would be "stealing" somebody elses intellectual property, or at the least very bad form in my opinion (sorry).
In real life, it would be a question of what the objective of the exercise was. Was it to learn saildesign and sailbuilding, doing it from the bottom up with several re-cuts would be better. It would also develop the "eye" for a good shape far more. If only an affordable copy of a standard sail was the objective, it could work. I would not want to try it with a radial or tri radial sail, too much work and potential problems <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" />